From: Tom Gall <tom_gall@vnet.ibm.com>
To: Michael Zhu <mylinuxk@yahoo.ca>
Cc: linux-kernel@vger.kernel.org
Subject: Re: The CURRENT macro
Date: Thu, 03 Jan 2002 16:55:37 -0600 [thread overview]
Message-ID: <3C34E169.FFE2DBED@vnet.ibm.com> (raw)
In-Reply-To: <20020103213455.34699.qmail@web14911.mail.yahoo.com>
Michael Zhu wrote:
>
> In Alessandro Rubini's book Linux Device Driver(Second
> Edition), Chatper 12, he said that "By accessing the
> fields in the request structure, usually by way of
> CURRENT" and "CURRENT is just a pointer into
> blk_dev[MAJOR_NR].request_queue". I know CURRENT is
> just a macro. Where can I find the definition of this
> macro?
> I just don't know how to get the struct request from
> the request_queue(a request_queue_t struct). CURRENT
> points to which field in the
> blk_dev[MAJOR_NR].request_queue? Thank you very much.
Look in include/asm-[your-arch]/current.h
It's architecture dependant. For instance on PPC64 we keep current in a
register.
Regards,
Tom
--
Tom Gall - [embedded] [PPC64 | PPC32] Code Monkey
Peace, Love & "Where's the ka-boom? There was
Linux Technology Center supposed to be an earth
http://www.ibm.com/linux/ltc/ shattering ka-boom!"
(w) tom_gall@vnet.ibm.com -- Marvin Martian
(w) 507-253-4558
(h) tgall@rochcivictheatre.org
next prev parent reply other threads:[~2002-01-03 22:03 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-01-03 21:34 The CURRENT macro Michael Zhu
2002-01-03 21:48 ` Jonathan Corbet
2002-01-03 21:55 ` Arnaldo Carvalho de Melo
2002-01-04 8:03 ` Terje Eggestad
2002-01-03 22:01 ` Richard B. Johnson
2002-01-03 22:14 ` Peter Makholm
2002-01-03 22:55 ` Tom Gall [this message]
2002-01-03 22:57 ` Tom Gall
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